Update: Alert canceled at Nine Mile 2

Operators have canceled an alert at the Nine Mile 2 nuclear power plant outside Oswego.

The alert was declared shortly after 3 p.m. today when carbon dioxide gas was detected in one of the plant's electrical switchgear rooms. The station's fire suppression system uses carbon dioxide, but no fire was found.

Investigators are still looking for the source of the carbon dioxide.

The "alert" status is the second-lowest of four nuclear plant emergency classifications.

The plant remained open throughout the alert, its 1,148-megawatt reactor continued power production and no off-site evacuations were ordered, plant officials said.

No release of radiation occurred and no injuries were reported, plant officials said.

The two Nine Mile Point nuclear power plants are operated by Constellation Energy.